USPS says package delivered. Was not. Need to apply for refund..

Send them a missing mail and they will help you regarding your concern. For more info you can check https://liteblueuspsgov.us/

Wow! I've come to discover that this entails quite a process. If they can prove that they have delivered your package there is really no recourse through USPS themselves, if your package was insured you might have an option in filing a claim with them. But,
- USPS gets 7 days to deliver your package. If it's still not there after 7 days, you can initiate a Missing Mail Search, this is all they will do for an uninsured package they say is delivered.
Visit https://www.usps.com/help/missing-mail.htm and setup an account if you don't have one. If it was insured, registered, COD, then you also have to be sure it's done within their "window of opportunity". If USPS determines the package was delivered, you'll have to treat it as a stolen package, which in your case they have.
For uninsured packages USPS claims to be delivered the follow these steps

1. Be aware that if USPS can prove that the package was delivered, you won't be able to file a claim with them because they fulfilled their end of the bargain.
2. File a complaint with the U.S. Postal Inspection Service. (Think of them as the mail cops.)
3. File a police report.
4. While neither of these options will help you get your package back, they can help law enforcement better understand and map crime rates in your area.
5. If you paid for third party package insurance, or your homeowner's insurance covers it, then you should probably look at that option now.

Please contact USPS tool free number for instructions or follow the link to file a claim online File Claim USPS